<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>

</body>
<script>
    var damu ={
        name:"达姆"
    }

    Object.defineProperty(damu,"wife",{
        value:"周冬雨"
    })

    damu.wife="晓飞张"
    delete damu.wife
    console.log(damu.wife)
</script>
</html>